After seven intense races in seven countries, Martin Sonka, Yoshihide Muroya, Pete McLeod and Kirby Chambliss remain in the running for the 2017 title. Here's how the possibilities shape up for the Red Bull Air Race season finale at the holy grail of motorsport, the USA's Indianapolis Motor Speedway.

(To know: If there's a tie in the points, the World Championship is decided on race results. The pilot with the most 2017 race wins gets the title; or if both have the same number of wins, the trophy goes to the pilot with the most second-place results, and so on.)

Martin Sonka(Currently 63 points with 2 wins, 2 thirds, 1 fourth, 1 fifth, 1 ninth) At the top of the standings, Sonka is the man to beat. He could – on paper, anyway – wear the crown even if he finishes last at Indianapolis. But his opponents aren't likely to give him that much help! Sonka will be World Champion if...

Muroya finishes seventh or lower, McLeod fourth or lower, Chambliss third or lower

11th-14th

63

Muroya finishes eighth or lower, McLeod fourth or lower, Chambliss third or lower

Yoshi Muroya(Currently 59 points with 3 wins, 1 third, 1 sixth, 2 thirteenths)The only pilot with three wins so far this season, Muroya is in a strong position only four points behind Šonka. But if he finishes lower than 7th place at the speedway, his chance for the championship is gone.

Sonka finishes 11th or lower, McLeod fourth or lower, Chambliss third or lower

Pete McLeod(Currently 56 points with 0 wins, 3 seconds, 1 third, 1 fifth, 1 seventh, 1 tenth)McLeod has been on the podium four times in 2017, more than any previous season in his career. To take the title for Canada, he must add one more race podium to that tally... and get a little help from his rivals.

Kirby Chambliss(Currently 52 points with 2 wins, 2 fourths, 1 sixth, 1 eighth, 1 eleventh) The odds are against the two-time titleholder, but another World Championship could still be on the cards if Chambliss finishes first or second and Lady Luck does the rest.

Position

Points

World Champion if...

Win

67

Sonka finishes eighth or lower, Muroya fourth or lower, McLeod third or lower